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-" B19 Sinker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921 96M <br /> Analytical NW ti FAX(916)9210100 <br /> WWW sequondabs corn <br /> ' Geological Technics,Inc Project Cardoza 5412258 <br /> 1101 7th Street Project Number 662 2 Reported. <br /> ' Modesto CA,95354 Project Manager Joseph Angulo 12/23/04 12 28 <br /> GasohnelBTEX1Cxygenates by EPA method 8260B-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting SpiLe Source %REC RPD <br /> Analyte Result Limit Units Level Result "/eREC Lmuts RPD Limit Notes <br /> ' Batch 4120262-EPA 5030B /T /EPA 8260E <br /> Matrix Spike(4120262-MSI) Source 5412195-03 Prepared 12/20/04 Analyzed I2/21/04 <br /> Methyl tert-butyl ether 216 050 ugll 200 ND 108 60-140 <br /> ' Benzene 200 050 200 ND 100 70-130 <br /> Toluene 205 050 200 ND 102 70-130 <br /> Surrogate 12-DCA-d4 930 100 93 60-140 <br /> ' Surrogate Toluene-d8 906 w10 0 91 60-140 <br /> Surrogate 4-BFB 947 100 95 60-140 <br /> Matrix Spike Dup(4120262-MSD1) Source 5412195-03 Prepared 12/20/04 Analyzed. 12/21/04 <br /> Methyl tent-butyl ether 213 050 ugll 200 ND 106 60-140 1 25 <br /> Benzene 186 050 200 ND 93 70-130 7 25 <br /> Toluene 204 050 200 ND 102 70-130 05 25 <br /> Surrogate 11-DCA-d4 103 100 103 60-140 <br /> *urrogate Toluene-& 950 n 100 95 60-140 <br /> .rrogate 4-BFB 973 loo 97 60-140 <br /> ' Sequoia Analytical-Sacramento The results in thrs report apply to the samples analyzed in accordance with the chain of <br /> custody document.Unless otherwise stated results are reported on a wet weight baso <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 13 <br />